/**
Lensflare by <a href="http://www.local-guru.net/blog">guru</a>
*/

PImage l;

void setup() {
  size(300,300);
  smooth();
  
  PGraphics tmp = createGraphics( 100,100,P2D);
  tmp.beginDraw();
  tmp.background(0);
  tmp.fill(255);
  tmp.ellipse( 50,50,40,40);
  tmp.filter( BLUR, 4);
  tmp.ellipse( 50,50,40,40);
  tmp.filter( BLUR, 4);
  
  tmp.endDraw();
  l = tmp;
}

void draw() {
  float dx = 150 - mouseX;
  float dy = 150 - mouseY;
  
  background(64 - 64 * sqrt(sqrt( sq( dx/150 ) + sq(dy/150))));

  stroke( 0, 0, 230, 150);
  fill( 0,0, 230, 80);
  filter(BLUR,2);  
  shape( 150 - dx/2, 150 - dy/2, 5, 30);
  stroke( 0, 230, 0, 150);
  fill( 0,230, 0, 80);
  filter(BLUR,2);  
  stroke( 130, 0, 0, 150);
  fill( 130,0, 0, 80);  
  shape( 150 - dx/5, 150 - dy/5, 6, 7);  
  stroke( 230, 0, 230, 150);
  fill( 230,0, 230, 40);
  shape( 150 + dx/2, 150 + dy/2, 6, 30);  

  stroke( 230, 230, 130, 150);
  fill( 230,230, 130, 80);  
  shape( 150 + dx/8, 150 + dy/8, 6, 10);  


  stroke( 0, 0, 130, 250);
  fill( 0,0, 130, 80);  
  shape( 150 + dx/5, 150 + dy/5, 5, 10);
  filter( BLUR,2);
  
  filter(BLUR,2);

  blend( l, 0,0,l.width,l.height,mouseX - l.width/2, mouseY -l.height/2, l.width, l.height,ADD );
  
}

void shape( float x, float y, int n, float r ) {
  pushMatrix();
  translate( x, y);
  float a = TWO_PI/float(n);
  beginShape();
  for( int i =0; i < n; i++) {
    vertex( r * cos( a * i ), r * sin( a * i));
  }
  endShape(CLOSE);
  popMatrix();
}